Nonlinear spin wave dynamics in thin magnetic films and structures

• Applicants: Professor Sergej O. Demokritov, Ph.D.; Professor Dr. Burkard Hillebrands
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2015 to 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 259181367

• Final Report Year: 2019

Final Report Abstract

This project is devoted to the study of of various fundamental nonlinear spin-wave phenomena, including generation of spin-wave single- and multi-solitonic wavepackets with controllable shape, synchronization of spin-wave chaotic oscillations in active rings based on ferromagnetic films and multiferroic layered structures, as well as nonlinear spin-wave modes in metallic magnetic microand nanosystems with low damping confined in the two lateral dimensions driven by spin currents. A simultaneous study of both active and passive magnetic systems allows us a comprehensive investigation of a wide variety of effects that belong to the most modern directions of magnetism. The main achievement of the project is the demonstration of the route to control chaotic dynamics in active rings based on nonlinear spin waves, including fractal spin-wave solitons as well as amplification and excitation of spin waves by both parametric pumping and injection of pure spin current. This achievement enabled the development of novel electrically-controlled macro- and nano-size microwave oscillators as well as spin-wave logic gates which are of great importance for modern spin-based communication and signal-processing technologies, including image recognition, cryptography, and neuromorphic computing. In the course of the project implementation, we have also studied different propagation of spin waves in thermal gradients and introduced novel low-damping magnetic materials.

Publications

• “A spin-wave logic gate based on a width-modulated dynamic magnonic crystals”, Appl. Phys. Lett. 106, 102405 (2015)
  A.A. Nikitin, A.B. Ustinov, A.A. Semenov, A.V. Chumak, A.A. Serga, V.I. Vasuchka, E. Lähderanta, B.A. Kalinikos, and B. Hillebrands
  
• “All-optical characterisation of the spintronic Heusler compound Co2Mn0.6Fe0.4Si”, J. Phys. D: Appl. Phys. 48, 164015 (2015)
  T. Sebastian, Y. Kawada, B. Obry, T. Brächer, P. Pirro, D.A. Bozhko, A.A. Serga, H. Naganuma, M. Oogane, Y. Ando and B. Hillebrands
  
• "Analysis of the broadband chaotic spin-wave excitations in an active ring oscillator based on a metalized ferrite film", J. Phys. Conf. Ser. 769, 012089 (2016)
  A. V. Kondrashov, A. B. Ustinov, B. A. Kalinikos, S. O. Demokritov
  
• “Reconfigurable heat-induced spin wave lenses”, Appl. Phys. Lett. 109, 232407 (2016)
  O. Dzyapko, I. V. Borisenko, V. E. Demidov, W. Pernice, and S.O. Demokritov
  
• “Spin-electromagnetic waves in planar multiferroic multilayers”, J. Appl. Phys. 122, 014102 (2017)
  A. A. Nikitin, A. B. Ustinov, V. V. Vitko, A. A. Nikitin, A. V. Kondrashov, P. Pirro, E. Lähderanta, B. A. Kalinikos, and B. Hillebrands
  
• “Bullets and droplets: Two-dimensional spin-wave solitons in modern magnonics”, Low Temp. Phys. 44, 602 (2018)
  O.R. Sulymenko, O.V. Prokopenko, V.S. Tyberkevych, A.N. Slavin, A.A. Serga
  
• “Exact Spin-Wave Fractals in Magnonic Crystals”, Phys. Rev. Lett. 121, 107204 (2018)
  D. Richardson, B. Kalinikos, L. Carr, M. Wu
  
• “Excitation and Amplification of Spin Waves by Spin–Orbit Torque”, Adv. Mater. 1802837 (2018)
  B. Divinskiy, V.E. Demidov, S. Urazhdin, R. Freeman, A.B. Rinkevich, and S. O. Demokritov
  
• “Spin-wave propagation through a magnonic crystal in a thermal gradient”, J. Phys. D: Appl. Phys. 51, 344002 (2018)
  T. Langner, D.A. Bozhko, S.A. Bunyaev, G.N. Kakazei, A.V. Chumak, A.A. Serga, B. Hillebrands, V.I. Vasyuchka